You may need to Plex Dance the shows if you have renamed them and moved them between library types. The process clears bad matching information from the Plex database.
Please show how you have the files named and organized.
If the episodes are combined, use Multiple Episodes in a Single File naming.
Example:
../TV Shows <-- folder added to library
..../Stephen King's It (1990) {tvdb-113981} <-- Show_Name (year); ID optional
....../Season 01 <-- "Season" in English, two digits for number
......../Stephen King's It (1990) s01e01-e02.ext <-- Show_Name (year) sXXeYY-eZZ; ext = mkv/mp4/etc
